13”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• There is an old and a new version of the AM 221, both are listed in the Ebauches SA catalog from 1928 (see extra pictures)
• This movement is even older. The winding and hand setting mechanism is based on Swiss patent CH73212 from 1915. Therefore it is called ‘very old’ here
• The AM 220 and AM 223 are technically identical but have different bridge shapes
• The movement shown is missing the minute wheel

• Listing ID: 14262
• Manufacturer / Brand: AM
• Caliber: 221 very old
• Size in French Lignes: 13'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 15
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1915
• Country: Switzerland
• Identification: Dial side marked with AM logo. See remarks above.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-57#post-8053871